What is Contained in the Free Air

Free air around us (the atmosphere) is not a single substance; it is a mixture of several gases, water vapor, and tiny floating particles. 

Main components of free air
In the air we breathe, the main substances are:
Nitrogen (N₂) – about 78% of the air. It is colorless, odorless, and not directly used in breathing. 
Oxygen (O₂) – about 21% of the air; very important for breathing and burning processes.
Argon (Ar) – about 0.9% of the air; a noble gas that does not easily react with other elements. 
Carbon dioxide (CO₂) – a small amount (about 0.04%); important for photosynthesis and the climate.
Other trace gases – such as neon, helium, methane, hydrogen, xenon, ozone, etc. 

Besides gases, free air also contains:
Water vapor – comes from evaporation of seas, rivers, lakes, and soil. 
Aerosols / tiny particles – dust, salt from the sea, smoke, sulfate, nitrate, and other very small particles that float in the air.

Here are some short example sentences you can use:
“The air around us contains nitrogen, oxygen, and small amounts of carbon dioxide.”
“Water vapor in the air comes from evaporation of seas, rivers, and lakes.”
“Dust and tiny particles floating in the air are called aerosols.”
“The atmosphere protects living things and helps keep the Earth’s temperature stable.

Komentar

Posting Komentar

Postingan populer dari blog ini

Understanding About Menthol

Gambar
Menthol is a natural organic compound derived mainly from peppermint oil and other mint plants, characteristic cooling sensation on the skin and mucous membranes. It can be obtained by extracting mint oils or produced synthetically in the laboratory. What is menthol Menthol is a clear, colorless crystalline substance with a strong, minty smell and taste. It can exist in different stereoisomers, the most common natural form being (–)-menthol (l‑menthol), while the synthetic version is often a racemic mixture (±)-menthol. How it works in the body Menthol creates a cooling sensation because it activates cold receptors on the skin and mucous membranes, primarily the TRPM8 ion channels (and partly TRPA1), which send “cold” signals to sensory nerves. This stimulation produces a soothing, mildly local‑anesthetic effect and can help relieve mild itching, pain, and airway irritation. Main uses Skin and muscle care: Used in creams, balms, or gels for muscle pain, soreness, and mild h...
Baca selengkapnya

Inedible Crabs And Why

Gambar
Some crabs are inedible because they are either poisonous, contain strong toxins, have very little meat, or are unsafe to eat for health reasons.  Why some crabs are not edible Toxic or poisonous species Certain crabs, especially in the family Xanthidae (like some “mud crabs”), naturally accumulate toxins that can be deadly to humans, even when cooked.  In some regions, small reef crabs (for example Zozymus aeneus) are considered venomous and are avoided as food.  Toxin‑loaded organs (even in edible species) In otherwise eatable crabs (like Dungeness or blue crabs), health authorities warn against eating the viscera (“butter” or guts) because it can accumulate domoic acid or other toxins that cause serious illness.  These toxins come from polluted water or harmful algal blooms, so the same crab species may be safe in one area but dangerous in another.  More shell than meat Some crabs (such as stone crabs or certain king‑crab variants) have claws or b...
Baca selengkapnya

Various Superfoods The Rich Nutrients

Gambar
Superfoods are foods that are rich in nutrients such as vitamins, minerals, fiber, antioxidants, and healthy fats. They are not magic foods, but they can be a very healthy part of a balanced diet. Examples of superfoods Blueberries. Salmon. Avocado. Spinach. Broccoli. Chia seeds. Nuts. Eggs. Yogurt or kefir. Sweet potatoes. Simple explanation Blueberries are famous because they contain antioxidants and vitamins. Salmon is a superfood because it gives protein and omega-3 fats. Avocados are rich in healthy fats, fiber, and potassium. Leafy greens like spinach and kale are also considered superfoods because they are full of vitamins and minerals.
Baca selengkapnya